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The Science Fiction’s holy grail, Time Travel has been a popular topic in various books, movies and TV series for decades.
Time Travel is the ability to ‘travel’ between two different points of time, mostly involving a vehicle of some sort, which is able to arrive in the past or future.
According to physicist Albert Einstein, time is not a constant phenomenon as it appears, but is an illusion, and can vary from different vantage points.
Space is three-dimensional, and Time, according to the famous physicist, is the fourth dimension. It also speeds up or slows down, so is actually subjective, as stated in his Theory Of Special Relativity.
Einstein's theory of general relativity says that Time can be bent, stretched and squeezed, and the four-dimensional fabric with a huge mass creates a dimple, or bending of Space-Time, causing gravity.
This effect of time dilation is proven using GPS satellite technology in space, making astronauts not only travel space but in a slightly different time than the earthlings.
Wormholes are points in Space-Time in which the two different points are connected, allowing instant transportation of matter.
Blackholes too can be a possibility for time travel, according to another famous physicist, Stephan Hawking, who envisioned circling around them in the opposite direction.
Various fictional and semi-fictional methods are discussed in order to build a time machine. It is supposed to have ‘antimatter’, ‘negative-energy density’ and other exotic technology in order to work.
New research in Time-Travel suggests it is possible using focused gravitational fields in a doughnut-shaped hole.
Time Travel, in pop culture and theory, presents many unique situations and paradoxes, the most famous of them being the Grandfather Paradox, which is dealt with in the Terminator movies, along with Back To The Future.
The paradox states that if you travel back to the past and kill your grandfather, then you cannot be born in the first place, at least in that timeline. Some scientists have alternate theories involving a parallel universe to answer this.
Time Travel has been popularized in movies like Interstellar, episodes of Doctor Who, Back To The Future, and even the first Superman movie made in the 70s.
Time Travel is an engaging concept, which has plenty of questions, which the scientists are working on. New developments in quantum theories and particle study may provide answers to the various paradoxes.
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Many insights of Albert Einstein are now part of popular imagination: black holes, time warps, and wormholes show up in movies and books.
Less famous, but probably the most revolutionary pa...
The most fundamental aspects of nature stay the same.
For example, Einstein's papers on relativity show that the relationship between energy and mass is invariant, even though energy and mass can take on many different forms.
Even though matter produces energy, the energy-matter content of the universe never changes. Matter and energy are less fundamental than the underlying relationship between them.
We often think of things as the heart of reality. But most often the relationship is more important, not the stuff.
We may think "stuff" like space and time are unchangeable aspects of nature. In reality, the relationship between space and time stays the same.
Time is difficult to explain. When looking for a dictionary explanation, time is described as "the general term for the experience of duration." But what is duration?
We have contra...
The idea of time travel is a very recent idea that starts with H.G. Wells's 1895 novel, The Time Machine. After that, we find the concept in American science fiction, or in modernist literature - each twisting time in new ways, to explore the unpredictability of memory.
Stephen Hawking also played with the idea of time travel. He proposed the idea that it can't happen because it didn't happen.
The internet changed our perception of time: We're looking at the past on our video screens, and it's just as clear as something in the present, making it feel like an unending present.
Time travel is also a powerful way to imagine what the future might bring. Time travel allows us to explore the consequences of our worst tendencies.